BY SADAF CASSIM  - FOR RURAL REVIVAL If you have ever driven on old 44, just southeast of town, you might have noticed in the middle of the fields, a small house-like structure. And perhaps on a different day you spotted that same structure but most definitely in a different field. Happily, your senses are, in fact, sound and can be explained by an uncommon agricultural practice: the mobile chicken coop. While not a new concept, this unique and innovative practice is certainly not standard amongst the farms one finds in South Dakota.